Class Dot11

scapy/layers/dot11.py:695–826

# 802.11-2020 9.2.4.1.1
class Dot11(Packet):
    name = "802.11"
    fields_desc = [
        BitMultiEnumField("subtype", 0, 4, _dot11_subtypes,
                          lambda pkt: pkt.type),
        BitEnumField("type", 0, 2, ["Management", "Control", "Data",
                                    "Extension"]),
        BitField("proto", 0, 2),
        ConditionalField(
            BitEnumField("cfe", 0, 4, _dot11_cfe),
            lambda pkt: (pkt.type, pkt.subtype) == (1, 6)
        ),
        MultipleTypeField(
            [
                (
                    FlagsField("FCfield", 0, 4,
                               ["pw_mgt", "MD", "protected", "order"]),
                    lambda pkt: (pkt.type, pkt.subtype) == (1, 6)
                ),
                (
                    FlagsField("FCfield", 0, 2,
                               ["security", "AP_PM"]),
                    lambda pkt: (pkt.type, pkt.subtype) == (3, 1)
                )
            ],
            FlagsField("FCfield", 0, 8,
                       ["to_DS", "from_DS", "MF", "retry",
                        "pw_mgt", "MD", "protected", "order"])
        ),
        ConditionalField(
            BitField("FCfield_bw", 0, 3),
            lambda pkt: (pkt.type, pkt.subtype) == (3, 1)
        ),
        ConditionalField(
            FlagsField("FCfield2", 0, 3,
                       ["next_tbtt", "comp_ssid", "ano"]),
            lambda pkt: (pkt.type, pkt.subtype) == (3, 1)
        ),
        LEShortField("ID", 0),
        _Dot11MacField("addr1", ETHER_ANY, 1),
        ConditionalField(
            _Dot11MacField("addr2", ETHER_ANY, 2),
            lambda pkt: (pkt.type not in {1, 3} or
                         pkt.subtype in [0x4, 0x5, 0x6, 0x8, 0x9, 0xa, 0xb, 0xe, 0xf]),
        ),
        ConditionalField(
            _Dot11MacField("addr3", ETHER_ANY, 3),
            lambda pkt: (pkt.type in [0, 2] or
                         ((pkt.type, pkt.subtype) == (1, 6) and pkt.cfe == 6)),
        ),
        ConditionalField(LEShortField("SC", 0), lambda pkt: pkt.type not in {1, 3}),
        ConditionalField(
            _Dot11MacField("addr4", ETHER_ANY, 4),
            lambda pkt: (pkt.type == 2 and
                         pkt.FCfield & 3 == 3),  # from_DS+to_DS
        )
    ]